Source Amplifier Mirror Circuits for Faster Pixel Charging
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Solution Overview
Problem
As the distance between the source driver and pixels increases, the resistances and capacitances of the source lines increase, leading to a longer time required to charge pixels with data voltage, which affects the display performance of electronic devices.
Innovation Solution
A source amplifier is designed with a first circuit that generates currents based on driving and input voltages to output a data voltage, and a second circuit that includes mirror circuits to supply additional currents, optimizing the output and enabling faster charging of pixels by adjusting current levels based on an enable signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the distance between source driver and pixels increases, then the display area can be enlarged, but the resistance and capacitance of source lines increase causing longer charging time
Solution Approach 1:
The source driver is divided into multiple source amplifiers (first source amplifier, second source amplifier, etc.) that are distributed along the source lines. Each source amplifier independently drives a segment of pixels, reducing the effective distance and impedance that each amplifier must overcome, thereby maintaining fast charging times across a larger display area.
Solution Approach 2:
Additional source amplifiers are introduced as intermediary devices between the original source driver and distant pixels. These intermediate amplifiers boost the signal strength and reduce the effective impedance of long source lines, enabling faster charging of pixels that would otherwise be too far from the original driver.
2Speed
If additional current is supplied to distant pixels to reduce charging time, then the operating speed improves, but unnecessary current may cause overshoot or undershoot of output voltages
Solution Approach 1:
The source amplifiers are controlled by enable signals that dynamically adjust their operation based on pixel distance. Distant pixels receive enhanced current during critical charging periods, while nearby pixels use normal current levels. This dynamic adaptation prevents overshoot and undershoot by matching the current supply to the actual charging needs of each pixel group.
Solution Approach 2:
Different source amplifiers provide different current levels tailored to their specific requirements. Source amplifiers driving distant pixels supply higher currents to overcome increased impedance, while those driving nearby pixels use lower currents. This localized optimization achieves fast charging where needed without causing voltage instability elsewhere.
Data Source
AI summary
Disclosed is a source amplifier which includes a first circuit that outputs a first current to an output terminal of the source amplifier by amplifying an input voltage, and a second circuit that is connected with the first circuit and outputs a second current to the output terminal based on the input voltage. The second circuit includes a third circuit that adjusts a level of the second current in response to an enable signal.